docs: update settings up docs to mention required Git note for alpha/… #171

Job	Run time
test / prevent-duplicate-checks	2s
test / test_matrix (16)	36s
test / test_matrix (18)	35s
test / test_matrix (20)	30s
test / sonarcloud	57s
test / required_check	1s
release	42s
	3m 23s

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